JPH0679577A - Fluid feeder for main spindle - Google Patents

Abstract

PURPOSE:To provide such a coolant feeder for a main spindle that facilitates handling of a feeding pipeline 30 constituting an outer feeding channel of a coolant by eliminating an endless belt for transmitting drive force of a main spindle drive motor to a main spindle. CONSTITUTION:A shaft of a main spindle drive motor 24 is made into a hollow shaft 25. a coolant feeding pipeline 30 is connected to the rear end in the hollow shaft 25, the main spindle 22 is coupled with the front end of the hollow shaft 25 by a coupling 27, and the front end part in the hollow shaft 25 and the rear end part of a supply hole 29 bored in the main spindle 22 are coupled by a cylindrical inner coupling 35 provided in the coupling 27. Thereby during cutting processing by the cutting blade 34 of a tool 32 which is installed in the front end part of Late main spindle 22, coolant is jetted from a coolant feed source through a feeding pipeline 30, the hollow shaft 25, a feeding hole 29, and a feeding path 33 in the tool 32 to the cutting blade 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply device for supplying a fluid such as a coolant to a fluid supply hole provided in a spindle of a machine tool.

[0002]

2. Description of the Related Art In order to improve the influence of coolant on a cutting edge of a tool in accordance with high-speed cutting, coolant is supplied from the outside of the spindle to a supply hole provided in the shaft center portion of the spindle of a machine tool. A coolant supply device for the spindle is used.

A conventional coolant supply device as described above will be described with reference to FIG. In FIG. 2, reference numeral 1 is a spindle head of a machine tool, and a spindle 2 is rotatably supported by a spindle head 1 through an appropriate bearing 3, and is rotated above the spindle head 1 about a hinge pin 16. The spindle drive motor 4 is clamped as much as possible, and the drive side pulley 6 and the driven side pulley 7 are fitted to the shaft 5 of the motor 4 and the rear end portion of the main shaft 2 protruding rearward of the spindle head 1. It is fixed, and an endless belt 8 is hung on these pulleys 6 and 7.

A coolant supply hole 9 penetrating the main shaft 2 in the axial direction is formed at an axial center portion of the main shaft 2, and a rear end portion of the supply hole 9 constitutes a part of a coolant external supply passage. The front end of the supply pipe 10 is connected via a distributor 11. A tool 12 is mounted on the front end of the main shaft 2, and the front end of the supply hole 9 is connected to a coolant supply passage 13 provided in the tool 12. Supply path 13
Is branched into a plurality of parts in the tool 12, and a branch part 13 a is opened near the cutting edge 14 provided at the front end part of the tool 12.
The supply hole 9 and the supply passage 13 form an internal supply passage for the coolant.

The downstream side of the supply pipe 10 is held on the spindle head 1 side by a mounting bracket 15, passes through the inner peripheral side of the endless belt 8 and is bent to the front end side of the spindle head 1 and upstream of the supply pipe 10. The side end is connected to a coolant supply source (not shown) provided outside the spindle head 1.

In the conventional device for supplying a fluid such as a coolant, which is constructed as described above, the spindle 2 and the tool 12 are integrally rotated by the drive of the spindle driving motor 4, and the workpiece is cut by the cutting edge 14 thereof. To process. At the time of this processing, the coolant is passed from the coolant supply source to the external supply flow passage, is pressure-fed to the supply hole 10 in the main shaft 2 via the supply pipe 10 and the distributor 11 in this flow passage, and the pressure-fed coolant is fed in the tool It passes through the passage 13 and is jetted toward the cutting edge 14 from the opening at the front end of the passage 13 to cool the cutting edge 14 and the processing portion formed thereby.

Further, when adjusting the tension of the endless belt 8 or when exchanging the tension, the clamp of the spindle drive motor 4 is released,
Rotate the motor 4 about the hinge pin 16,
The lengths between the drive side and driven side pulleys 6 and 7 are changed to perform the adjustment and replacement work.

[0008]

The above-described conventional coolant supply device for a spindle is provided behind the spindle head 1 on the drive side,
The driven pulleys 6 and 7 are located, the endless belt 8 is hung on them, and the coolant supply pipe 10 is connected to the main shaft 2.
Since it extends rearward, it is troublesome to attach and detach the endless belt 8 when exchanging it.

Since the coolant supply pipe 10 is passed from the front to the inner peripheral side of the endless belt 8 to eliminate these interferences and allow the endless belt 8 to be attached and detached, the handling of the supply pipe 10 becomes complicated. In particular, when the coolant supply source is arranged behind the main shaft 2, after guiding the supply pipe 10 from the rear to the front of the endless belt 8,
There is a problem that the structure of the supply pipe 10 becomes complicated because it has to be folded back and passed through the endless belt 8 and connected to the rear end of the main shaft 2.

According to the present invention, the endless belt for transmitting the driving force of the motor for driving the spindle to the spindle is eliminated, and the arrangement of the members such as the pipes forming the external supply passage of the fluid such as the coolant can be simplified. It is an object of the present invention to provide a fluid supply device for a spindle, which is suitable for high speed machining such as cutting.

[0011]

In a fluid supply device for a spindle according to the present invention, a downstream end of an external supply passage for a fluid such as a coolant is connected to a rear end portion of a hollow shaft provided in a spindle drive motor. The front end of the hollow shaft and the rear end of the main shaft are connected via a coupling, and the rear end of the fluid supply hole provided in the main shaft and the front end of the hollow shaft are provided in the coupling. It is connected through an inner coupling.

[0012]

In the fluid supply device for the main shaft according to the present invention, the shaft of the motor for driving the main shaft is a hollow shaft, and this hollow shaft is connected to the main shaft through a coupling. No need to perform maintenance work such as tension adjustment and replacement of the endless belt, and in particular, the external supply device for fluid such as coolant can be connected to the hollow shaft without considering interference with the endless belt.
The handling of the supply pipes that make up the external supply channel is simplified. Further, since the inside of the hollow shaft and the fluid supply hole provided in the main shaft are communicated with each other through the inner coupling, the fluid does not leak from this communication portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 is a spindle head of a machine tool, a spindle 22 is rotatably supported on a spindle head 21 through an appropriate bearing 23, and an AC spindle drive motor 24 is provided at a rear end of the spindle head 21. Are fixed via a mounting member 26. The drive motor 24 is provided with a hollow shaft 25, and a rotor (both not shown) fitted to a stator is fixed to the outer periphery of the hollow shaft 25.

The front end of the hollow shaft 25 and the rear end of the main shaft 22 are connected in the rear recess 21a of the main shaft head 21 via a flange type coupling 27, and the opening of the rear recess 21a is removable. It is closed by a transparent cover 28. Spindle 2
A fluid supply hole 29 penetrating the main shaft 22 in the axial direction is formed in the axial center portion of the main shaft 22, and a tool 32 is detachably fixed to the front end portion of the main shaft 22, and the front end of the supply hole 29 is inside the tool 32. Is connected to the fluid supply path 33 provided in the. Supply path 3
3 is branched into a plurality of branch portions 33a in the tool 32, and these are opened near the cutting edge 34 provided at the front end portion of the tool 32. The supply hole 29 and the supply passage 33 form an internal supply passage for the fluid.

At the rear end of the hollow shaft 25, a downstream end of a supply pipe 30 forming a part of an external supply passage is connected via a distributor 31, and an upstream end of the external supply passage is at a spindle head. 21 is connected to a coolant supply source (not shown) provided outside. Further, the rear end of the supply hole 29 provided in the main shaft 22 and the front end of the hollow shaft 25 are connected via a cylindrical inner coupling 35. The inner coupling 35 is disposed in the coupling 27, and the front end portion is fitted and held in the supply hole 29 and the rear end portion is fitted and held in the hollow shaft 25 via O-rings 36 for preventing fluid leakage. ing.

In the fluid supply apparatus of the embodiment constructed as described above, the hollow shaft 25 of the drive motor 24 is rotated by the drive of the drive motor 24, and the main shaft 2 is rotated through the coupling 27.
2 and the tool 32 are integrally rotated, and the cutting edge 34 cuts the workpiece.

At this time, the coolant from the coolant supply source is passed through the external supply flow path, and is pressure-fed to the supply hole 29 in the main shaft 22 through the supply pipe 30, the distributor 31, and the hollow shaft 25 in this flow path. Coolant, tool 3
It is passed through the supply passage 33 in 2 and jetted from the opening at the front end thereof to the cutting blade 34, thereby cooling the cutting blade 34 and the processing portion formed thereby. When the coolant passes through the hollow shaft 25, the coolant cools each part of the drive motor 24 such as the hollow shaft 25.

The fluid supply device according to the present invention can also be used to supply air for dry cutting. Further, the tool mounted on the spindle can be appropriately changed without being limited to that of the embodiment, and the fluid supply hole formed in the spindle and the fluid supply path formed in the tool, that is, the configuration of the internal supply passage, It can be changed appropriately.

[0019]

As described above, in the fluid supply device for the main shaft according to the present invention, the shaft of the motor for driving the main shaft is a hollow shaft, and the hollow shaft is connected to the main shaft through the coupling. This eliminates the generation of noise, eliminates the need for maintenance work such as tension adjustment and replacement of the endless belt, and the external supply device for fluid such as coolant is installed on the hollow shaft without considering the interference with the endless belt. By being able to connect, it becomes easy to arrange the supply pipe forming the external supply flow path, and there is an effect that it is suitable for speeding up such as cutting.

The fluid supply device according to the present invention comprises:
Since the inside of the hollow shaft and the fluid supply hole provided in the main shaft are connected via the inner coupling, the fluid does not leak from this communication part, and the fluid such as coolant is stably ejected to the part processed by the tool. Can be made.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing a fluid supply device for a spindle according to an embodiment of the present invention.

FIG. 2 is a partially longitudinal explanatory view showing a conventional fluid supply device for a spindle.

[Explanation of symbols]

 21 Spindle Head 22 Spindle 24 Motor for Spindle Drive 25 Hollow Shaft 27 Coupling 29 Fluid Supply Hole 30 Supply Pipe (External Supply Flow Path) 32 Tool 33 Supply Path 34 Cutting Edge 35 Inner Coupling 36 O-ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sendaro Sugita 1-1 1-1 Asahi-cho, Kariya city, Aichi prefecture Toyota Koki Co., Ltd.

Claims (1)

[Claims] 1. A shaft of a motor for driving a main shaft of a machine tool is a hollow shaft, and a rear end of the hollow shaft is connected to a downstream end of an external supply passage for a fluid such as a coolant, and a front end of the hollow shaft. The rear end of the main shaft is connected via a coupling, and the rear end of the fluid supply hole provided in the main shaft and the front end of the hollow shaft are communicated via the inner coupling provided in the coupling. A fluid supply device for a spindle, characterized in that